56 lines
1.8 KiB
Groff
56 lines
1.8 KiB
Groff
.\" @(#)arithmetic.6 1.1 94/10/31 SMI; from UCB 4.2
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.TH ARITHMETIC 6 "1 February 1983"
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.SH NAME
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arithmetic \- provide drill in number facts
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.SH SYNOPSIS
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.B /usr/games/arithmetic
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[
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.B +\-x/
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] [ range ]
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.SH DESCRIPTION
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.IX "arithmetic command" "" "\fLarithmetic\fP \(em drill in number facts"
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.I Arithmetic
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types out simple arithmetic problems, and waits for an answer to be typed in.
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If the answer is correct, it types back \*(lqRight!\*(rq, and a new problem.
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If the answer is wrong, it replies \*(lqWhat?\*(rq,
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and waits for another answer.
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Every twenty problems, it publishes
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statistics on correctness and the time required to answer.
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.PP
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To quit the program, type an interrupt (delete).
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.PP
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The first optional argument determines the kind of problem to be generated;
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.B +\-x/
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respectively cause addition, subtraction, multiplication, and division
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problems to be generated.
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One or more characters can be given;
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if more than one is given, the different types of
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problems will be mixed in random order; default is
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.B +\-
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.PP
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.I Range
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is a decimal number;
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all addends, subtrahends, differences, multiplicands, divisors,
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and quotients will be less than or equal to the value of
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.IR range .
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Default
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.I range
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is 10.
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.PP
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At the start, all numbers less than or equal to
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.I range
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are equally likely to appear.
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If the respondent makes a mistake,
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the numbers in the problem which was missed
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become more likely to reappear.
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.PP
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As a matter of educational philosophy, the program will
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not give correct answers, since the learner should, in principle,
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be able to calculate them.
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Thus the program is intended to provide drill for
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someone just past the first learning stage, not to teach number facts
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.I de
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.IR novo .
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For almost all users, the relevant statistic should be
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time per problem, not percent correct.
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